Pulp screen



y 0, 1929. H. D. WELLS 1,722,874

PULP SCREEN Filed Jan. 13, 1928 2 Sheets-Sheet l '4 g 38 u I ar 5 INVENTOR y '1 929. D. WELLS 1,722,874

PULP 5 GREEN Filed Jan, 15, 1928 2 Sheets-Sheet 2 Tic za? i INVENTOR WHNESStS Harald D. VVe-lls JMW ATTORNEY Patented July 30, 1929. I

UNITED STATES 1,722,874 PATENT OFFICE.

HAROLD D. WELLS, OF GLENS FALLS, NEW YORK.

PULP SCREEN.

Application filed January 13, 1928. Serial No. 246,539.

, to force only the paper-making fibre therethrough, while at the same time subjecting the stock to a thorough washing action so that all of the paper making fibre is removed from the stock and none of it left in the tailings which are rejected from the machine.

An object of the invention is to provide a screen of this character which passes only the. best quality paper-making fibre and thoroughly cleans the stock. Other objects are to provide a completely enclosed screening apparatus so that dirt cannot get into the stock, and there in no danger of spilling during the screening operation.

Further objects are to provide an apparatus in which no air'is mixed with the stock in the screen, and in which there is no foaming and on lumps formed.

Still further objects are to provide a screen in which no concrete platform is required and the device may be set directly on the main floor and discharged at any desired height above the machine proper.

The invention further contemplates the use of a screen in. which the motion is enfully set forth and pointed out in the claims.

The invention may be more fully understood from the following description 1n connection with the accompanying drawings, wherein-*- Fig. 1 is a view in side elevation, showinga screening apparatus embodying the present invention.

Fig." 2 is a longitudinal sectional view therethrough taken approximately on the line 22 of Fig. 3.

Fig. 3 is a transverse sectional view 'on the staggered line 33 of Fig. 2.

Flg. 4 is an enlarged sectional detail trllnfmgh one of the packings of the rotor s a t.

Fig. 5 is an enlarged sectional detail show-- ing the operation of one of the screens in its carrier frame.

Fig. 6 is an elevational view of one of the rotor blades.

Fig. 7 is a transverse sectional view therethrough on the line 7-7 of-Fig. 6.

Referring with particularity to the drawing I have used the reference numerals 1O and 11 to designate-thetwoiend castings of the casing of the machine. These castings rest upon integral feet 12 and are connected at the top and bottom by a top casting 13 and bottom casting 14 respectively. Cooperating with the end castings and the top and bottom castings to form a casing of generally circular cross sectional shape, are

a pair of movable arcuate side plates 15. These plates at their lower edges carry angle irons 16 engaged with hooks 17 of the bottom castings 14. At their upper edges the plates 15 carry angle irons 18 adapted to receive the threaded ends of I-bolts 19 pivoted to lugs 20 on the outwardly and downwardly flaring flanges 13 of the upper casting 13. The bolts 20 pass through openings in the angle irons 18 and are secured by nuts 21. By virture of the above described construction and the use ofhandles 22 on the removable side plates 15, these members may be readily removed from the machine The screen 23 may be formed of any suit- 1 its ends by inwardly projecting flanges 25 and 26 integral with the castings 10 and 11 respectively. It is to be understood that the screen and its supporting frameare stationary members. 1

A horizontal rotor shaft 27 has suitable bearings at 28 and 29 and bearing brackets I through specially designed stufiing boxes or packings enclosed within cup-shaped mem-' bers 32 secured to the outer faces of the end castings of the machine.

Keyed to the shaft 27 is a rotor 33in the nature of a hollow apertured drum which tapers toward one end as indicated at 34.

Extending longitudinally of the drum and in parallelism with each other, are blades 35 bolted or otherwise secured to the exterior surface of the rotor. These blades lie machine is filled with stock, to forcethe pulpy mass gently toward and through the cylindrical screen 23 which surrounds the' rotor and is disposed immediately adjacent the blades.

In Fig. 41 have illustrated an enlarged detail of one of the stufling boxes in which a soft rubber sleeve 40 encircles the shaft v 27 when in the, cup 32; this sleeve being held in place by a metallic collar 41. and a free flow of water being maintained through the cup by water inlet and outlet pipes 42and 43 enteringand leaving the top ofthe cuplike member 32. Y

Stock-is delivered into the casing through a pipe" 44 connected to the top of an inclined sheet 45 integral with the end casting 10. The paper-making fibre which passes through the screen 23 leaves the ma-. chine through a vertical up-flow pipe 46.

connected to the top casting l3. All of the i fibre which passes through the screen enters and the casing, and is forced or sucked upthe annular chamber defined by the screen wardly through the pipe 46. Tailings or rejections pass out of the machine through a pipe 47 secured near the-lower end of the casting 11. This pipe may be provided with any suitable number of traps such as 48 for the heavier tailings; these traps being in the nature of rotary dumping troughs. Water is delivered into the interior of the rotary perforated drum 34 through a water inlet pipe 49 maintained in continuous alignment with one of a series, of openings 50 which encircle one hub of the drum.

. In operation, the stock assin tionally or under pressure own t e flue 45,

is moved between the rotor and the screen;

the rotor bladesserving to gently force the paper making fibres through the screen and into the annular chamber between the screen and easing, from whence they pass upward 1y through the pipe 46. A strong stream of water constantly entering the rotor drum discharges in a seriesof-radial jets, aiding not only to force. fibrous stock through the screen, but to effectively wash the fibres gravitafrom the tailings and slivers, which, latter pass to rejection through the pipe 47.

It will be noted that the tapered arrangement of the drum also serves to gradually compress the stock as it moves from one end of the casing tothe other; this compression in addition to the action of the water jets and distributing blades tending to force all of the fibrous portion of' the stock through the screen. The blades 35 serve the additional important function of evenly distributing the stock over the whole surface of the drum and screen. Any suitable means of driving the rotor, such for instance as the pulleys 51 may be utilized.

Obviously, various changes and alteratlons might be made in the general form and arrangement of the parts described without departing from the invention. Hence I do not wish to limit myself to the details set forth, but shall consider myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of the appended claims. F

I claim:

1. A pulp screen including a casing of generally cylindrical cross sectional shape, a cylindrical screen mounted within the casing and defining therewith an annular chamber into which fibre passes through the screen, an apertured rotary drum mounted within and spaced from the screen, means for delivering stock into the screen, means- -for carrying-off screened fibre, means for delivering water to the interior of the drum, and means for carrying ofi tailings, the drum at one end having a circular series of openings therein successively registering with the water supply means, the latter comprising a pipe delivering into one endof the casing. e

2. A pulp screen including a casing of generally cylindrical cross sectional shape, a cylindrical screen mounted within the casing and defining therewithan annular chamber into whichfibre passes through the screen, an apertured rotary drum mounted within and spaced from the screen, means for delivering stock into the screen, means for carrying oflI' screened fibre, means for delivering water tothe interior of the drum, and means for carrying 'ofi tailings, the

means for delivering. stock" comprising. a

chute formed in one end of the casing, the means for carrying off screened fibres comprising a vertical conduit opening into the top of the casin 3. A, casing Eor pulp screens including pairsp-ofend castings rigidly connected together,"removable side plates .cooperating with said end plates, and connecting means to form a generally cylindrical screening chamber. 3 I I 4. A casing for pulp screens including pairs of end castings rigidly connected taggether, removable side plates cooperating with said end plates and connecting means to form a generally cylindrical screening chamber, said connecting means comprising top and bottom castings.

5. A casing for pulp screens including pairs of end castings rigidly connected together, removable side 'plates cooperating with said end plates and connecting means to form a generally cylindrical screening chamber, said connecting means comprising top and bottom castings, the latter having an opening therein through which screened fibres are adapted to pass.

6. A casing for pulp screens including pairs of end castings rigidly connected together, removable side plates cooperating with said end plates, and connecting means to form a generally cylindrical screening chamber, one of said end castings being formed with an integral entry chute forpulp stock.

7. A casing for pulp screens including pairs of end castings rigidly connected together, removable side plates cooperating with said end plates, and connecting means to form a generally cylindrical screening chamber, said end castings including brackets mounting bearings for a drum shaft extending through the chamber.

Signed at Glens Falls, in the county of Warren and State of New York, this 11th day of January, 1928.

HAROLD D. WELLS. 

